The above statement is pure nonsense. There is no reason not to use smokeless powder in a cartridge revolver if pressures are kept to the same level as the original loads. In actuality, current factory smokeless loads will be safe if the gun is in good condition. Factory loads are kept down to BP pressures because most of the guns that are chambered in .44-40 are not as strong as modern guns. For example, the Winchester 1873 and the Colt Lightning rifle are not very strong.

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Tom
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